================================================================== BUG: KASAN: stack-out-of-bounds in ft260_smbus_write+0x19b/0x2f0 drivers/hid/hid-ft260.c:486 Read of size 42 at addr ffffc9000db67d81 by task syz.4.2613/15040 CPU: 0 UID: 0 PID: 15040 Comm: syz.4.2613 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:194 [inline] kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:200 __asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105 ft260_smbus_write+0x19b/0x2f0 drivers/hid/hid-ft260.c:486 ft260_smbus_xfer+0x22c/0x640 drivers/hid/hid-ft260.c:736 __i2c_smbus_xfer drivers/i2c/i2c-core-smbus.c:591 [inline] __i2c_smbus_xfer+0x4f0/0xf60 drivers/i2c/i2c-core-smbus.c:554 i2c_smbus_xfer drivers/i2c/i2c-core-smbus.c:546 [inline] i2c_smbus_xfer+0x200/0x3c0 drivers/i2c/i2c-core-smbus.c:536 i2cdev_ioctl_smbus+0x237/0x990 drivers/i2c/i2c-dev.c:389 i2cdev_ioctl+0x361/0x840 drivers/i2c/i2c-dev.c:478 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f16b998f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f16ba7da038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f16b9be6090 RCX: 00007f16b998f749 RDX: 0000200000000200 RSI: 0000000000000720 RDI: 0000000000000008 RBP: 00007f16b9a13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f16b9be6128 R14: 00007f16b9be6090 R15: 00007fff4f115d08 The buggy address belongs to stack of task syz.4.2613/15040 and is located at offset 49 in frame: i2cdev_ioctl_smbus+0x0/0x990 drivers/i2c/i2c-dev.c:632 This frame has 1 object: [48, 82) 'temp' The buggy address belongs to a 8-page vmalloc region starting at 0xffffc9000db60000 allocated at kernel_clone+0xfc/0x910 kernel/fork.c:2651 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880473ff000 pfn:0x473ff memcg:ffff88803267b502 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: ffff8880473ff000 0000000000000000 00000001ffffffff ffff88803267b502 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x29c2(GFP_NOWAIT|__GFP_HIGHMEM|__GFP_IO|__GFP_FS|__GFP_ZERO), pid 14932, tgid 14932 (syz.2.2581), ts 583832035440, free_ts 583827820261 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5240 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2577 vm_area_alloc_pages mm/vmalloc.c:3649 [inline] __vmalloc_area_node mm/vmalloc.c:3863 [inline] __vmalloc_node_range_noprof+0xe6c/0x16b0 mm/vmalloc.c:4051 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4111 alloc_thread_stack_node kernel/fork.c:354 [inline] dup_task_struct kernel/fork.c:923 [inline] copy_process+0x619/0x7430 kernel/fork.c:2052 kernel_clone+0xfc/0x910 kernel/fork.c:2651 __do_sys_clone3+0x212/0x290 kernel/fork.c:2953 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 24 tgid 24 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2973 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4c/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] __kmalloc_cache_noprof+0x282/0x800 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] usb_control_msg+0xbc/0x4a0 drivers/usb/core/message.c:144 get_port_status drivers/usb/core/hub.c:607 [inline] hub_ext_port_status+0x14e/0x670 drivers/usb/core/hub.c:624 usb_hub_port_status drivers/usb/core/hub.c:674 [inline] hub_port_debounce+0x1a2/0x3f0 drivers/usb/core/hub.c:4705 hub_port_debounce_be_stable drivers/usb/core/hub.h:184 [inline] hub_port_connect drivers/usb/core/hub.c:5419 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x37f7/0x52f0 drivers/usb/core/hub.c:5953 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Memory state around the buggy address: ffffc9000db67c80: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000db67d00: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 f1 f1 >ffffc9000db67d80: 00 00 00 00 02 f3 f3 f3 f3 f3 00 00 00 00 00 00 ^ ffffc9000db67e00: 00 00 00 00 00 00 f1 f1 f1 f1 f1 f1 04 f2 00 00 ffffc9000db67e80: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================